php how to convert millisecond timestamp to date and time

PHP is a popular web programming language that has become the basis for millions of websites around the world. It is an open source language that is supported by many platforms and operating systems. PHP provides many powerful built-in functions, including date and time functions based on timestamps.

Millisecond timestamps (also known as UNIX timestamps) are a standard mechanism for recording time. It represents the number of seconds since January 1, 1970 00:00:00 UT (Coordinated Universal Time). Millisecond timestamps provide a cross-platform, cross-language way to represent dates and times.

Converting millisecond timestamp to date and time is very simple in PHP. Here are some methods that can be used:

Method 1: Use the date() function

The date() function is a built-in PHP function used to format dates and times. It accepts two parameters: the first parameter is the date format, and the second parameter is the timestamp to be formatted.

Here's how to convert millisecond timestamp to date and time:

$time_stamp = 1606458051373; // 毫秒时间戳
$milliseconds = $time_stamp % 1000;
$seconds = intval($time_stamp / 1000);
$date_time = date('Y-m-d H:i:s', $seconds) . '.' . str_pad($milliseconds, 3, '0', STR_PAD_LEFT);
echo $date_time; // 2020-11-27 08:34:11.373

In the above code, we first split the millisecond timestamp into seconds and milliseconds. We then use the date() function to convert the seconds into a readable date and time format. Finally, we add the number of milliseconds to the time string.

Method 2: Use the DateTime class

DateTime is a class in PHP used to process dates and times. It provides many powerful methods to easily convert from millisecond timestamps to dates and times.

Here is a sample code using the DateTime class:

$time_stamp = 1606458051373; // 毫秒时间戳
$date_time = DateTime::createFromFormat('U.u', sprintf('%.6F', $time_stamp/1000));
echo $date_time->format('Y-m-d H:i:s.u'); // 2020-11-27 08:34:11.373000

In the above code, we first divide the millisecond timestamp by 1000 to get the seconds and then format it as a floating point number And passed to the createFromFormat() method. This method returns a DateTime instance. Finally, we format the date and time into strings using the format() method.

Method 3: Use the strtotime() function

The strtotime() function is another built-in function in PHP that is used to convert text dates to timestamps. It also supports getting date and time from millisecond timestamp.

Here is the sample code on how to convert millisecond timestamp to date and time:

$time_stamp = 1606458051373; // 毫秒时间戳
$date_time = date('Y-m-d H:i:s', strtotime(sprintf('+%d milliseconds', $time_stamp)));
echo $date_time; // 2020-11-27 08:34:11

In the above code, we use sprintf() function to format the timestamp into a string, in This string is used in the strtotime() function to obtain the date and time. Finally, we format the date and time string using the date() function.

Conclusion

Converting millisecond timestamp to date and time is very simple in PHP. You can use the built-in date() function, the DateTime class, or the strtotime() function to accomplish this task. No matter which method you choose, you can easily convert millisecond timestamps into readable date and time formats.

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